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/*******************************************************************************
* Copyright (C) ST-Ericsson SA 2011
* License terms: 3-clause BSD license
******************************************************************************/
/**
* \addtogroup ldr_security_algorithms
* @{
*/
/*************************************************************************
* Includes
*************************************************************************/
#include "Hash.h"
#include "SecurityAlgorithms.h"
#include <cstdlib>
#include <cstring>
/***********************************************************************
* Declaration of file local functions
**********************************************************************/
/***********************************************************************
* Definition of external functions
**********************************************************************/
const uint32 red[16] = {
0,
(0x1 << 16) ^(0x1021 << 0), \
(0x2 << 16) ^(0x1021 << 1), \
(0x3 << 16) ^(0x1021 << 1) ^(0x1021 << 0), \
(0x4 << 16) ^(0x1021 << 2), \
(0x5 << 16) ^(0x1021 << 2) ^(0x1021 << 0), \
(0x6 << 16) ^(0x1021 << 2) ^(0x1021 << 1), \
(0x7 << 16) ^(0x1021 << 2) ^(0x1021 << 1) ^(0x1021 << 0), \
(0x8 << 16) ^(0x1021 << 3), \
(0x9 << 16) ^(0x1021 << 3) ^(0x1021 << 0), \
(0xa << 16) ^(0x1021 << 3) ^(0x1021 << 1), \
(0xb << 16) ^(0x1021 << 3) ^(0x1021 << 1) ^(0x1021 << 0), \
(0xc << 16) ^(0x1021 << 3) ^(0x1021 << 2), \
(0xd << 16) ^(0x1021 << 3) ^(0x1021 << 2) ^(0x1021 << 0), \
(0xe << 16) ^(0x1021 << 3) ^(0x1021 << 2) ^(0x1021 << 1), \
(0xf << 16) ^(0x1021 << 3) ^(0x1021 << 2) ^(0x1021 << 1) ^(0x1021 << 0)
};
Hash::Hash()
{
m_RequestQueue = new CSemaphoreQueue(16);
m_Thread = new CThreadWrapper(WorkerThread, this);
m_Thread->ResumeThread();
}
Hash::~Hash()
{
m_RequestQueue->SignalEvent();
m_Thread->WaitToDie();
delete m_Thread;
delete m_RequestQueue;
}
/*
* Hash device shutdown.
*
* @param [in] Object_p Initialized buffer context.
* @param [in] HashDevice_pp Pointer to hash device descriptor.
*
* @return none.
*/
void Hash::Cancel(HashDevice_t **HashDevice_pp)
{
delete *HashDevice_pp;
}
#ifdef _WIN32
unsigned int WINAPI Hash::WorkerThread(void *arg)
#else
void *Hash::WorkerThread(void *arg)
#endif
{
Hash *pThis = (Hash *)arg;
HashRequest *request = 0;
while (true) {
RemoveResult result = pThis->m_RequestQueue->RemoveHead(reinterpret_cast<void **>(&request), INFINITE);
if (REMOVE_SUCCESS != result) {
break;
}
switch (request->Type) {
case HASH_SHA256:
memset(request->Hash_p, 0, SHA256_LENGTH);
if (request->Length != 0) {
SecurityAlgorithms::SHA256(request->Data_p, request->Length, request->Hash_p);
}
break;
case HASH_CRC16:
memset(request->Hash_p, 0, CRC16_LENGTH);
if (request->Length != 0) {
uint16 CRC16 = crc16(request->Data_p, request->Length, 0);
memcpy(request->Hash_p, &CRC16, sizeof(uint16));
}
break;
case HASH_SIMPLE_XOR:
request->Hash_p[0] = 0;
if (request->Length != 0) {
request->Hash_p[0] = hashxor(request->Data_p, request->Length);
}
break;
case HASH_NONE:
break;
default:
// unsupported hash type, nothing to do
delete request;
continue;
}
request->Callback(request->Data_p, request->Length, request->Hash_p, request->Param_p);
delete request;
}
return 0;
}
/**
* Asynchronous hashing of data.
*
* Calculates a hash over the specified block of data, calling the call-
* back function on completion. Note that the callback function might
* execute in interrupt context, so due care should be taken when
* writing it.
*
* The hashing might be delayed if another operation is currently
* running.
*
* @param [in] Object_p Initialized buffer context.
* @param [in] Type Hash type.
* @param [in] Data_p Start of the block of data to hash.
* @param [in] Length The length in bytes of the block of data to hash.
* @param [out] Hash_p Start of the buffer that should hold the hash
* value.
* @param [in] Callback The function to call when the hash calculation
* completes.
* @param [in,out] Param_p The value to use as parameter to Param_p.
*
* @note Hash_p must be large enough to contain the selected hash type.
* Use the "HASH"_LENGTH macros when you know beforehand which hash
* type to use, or Do_Crypto_GetHashLength() for dynamically selected
* hashes.
*
*/
void Hash::Calculate(HashType_e Type, void *Data_p, uint32 Length, uint8 *Hash_p, HashCallback_fn Callback, void *Param_p)
{
HashRequest *currentRequest = new HashRequest;
currentRequest->Type = Type;
currentRequest->Data_p = (uint8 *)Data_p;
currentRequest->Length = Length;
currentRequest->Hash_p = Hash_p;
currentRequest->Callback = Callback;
currentRequest->Param_p = Param_p;
m_RequestQueue->AddTail(currentRequest);
/* coverity[leaked_storage] */
}
uint8 Hash::hashxor(const uint8 *Buf_p, uint32 Length)
{
uint8 Value = 0;
const uint8 *Stop_p = Buf_p + Length;
do {
Value ^= *Buf_p++;
} while (Buf_p < Stop_p);
return Value;
}
uint16 Hash::crc16(const uint8 *p, int count, uint16 crc_in)
{
register uint32 crc = crc_in;
while (--count >= 0) {
crc = crc ^(uint8) * p++ << 8;
crc ^= red[crc>>16];
crc = (crc << 4);
crc ^= red[crc>>16];
crc = (crc << 4);
crc ^= red[crc>>16];
}
return (uint16) crc;
}
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